why if i make a root class pool and a child classpool ,when i reference a ctclass from child class pool , i do not see all method from that?

i make a root class pool:

ClassPool RootClassPool;
RootClassPool = new ClassPool();
RootClassPool.getDefault();

ClassPool CP;
CtClass CTCLASSE;
.
.
.
CP = new ClassPool(RootClassPool);
try {
 CTCLASSE = CP.get("className");
 }
 catch(Exception e){System.err.println(e);}
.
.
.